Stability Analysis And Control Of The Soft And Broken Surrounding Rock In Qingdong Mine

Soft and broken the surrounding rock stability analysis and control has been one of the thorny problems of the troubled construction and production of coal mine safety. In this paper, the weakness of the Qingdong Mine crushing the surrounding rock as a research object, through theoretical analysis, numerical simulation and field test methods, analysis of the geological characteristics of the mine104return air roadway typical soft and fractured the surrounding rock and the deformation and failure of lawon this basis, that the strength of the surrounding rock to weaken the soft and broken the surrounding rock and beyond due to the result of both the fundamental instability and failure. Profound analysis of the soft and fractured the surrounding rock instability and failure mechanism of the key means of strengthening reinforced reinforcement bolting (cable), U-shaped steel reinforcement, and analyzed the mechanism of the soft broken Grouting its effectiveness.In this paper, the finite element software FLAC-3D numerical simulation to establish a studio anchor Note joint support program support Qingdong Mine104return air roadway. Simulation results show that:the stress distribution range in the use of the program has significantly narrowed the tension zone, compression zone and the plastic zone are significantly reduced; surrounding rock deformation was significantly reduced, the two sides and roof and floor of the surrounding rock, a small amount of plastic failure soon to stabilize the roof and floor yield, shed anchor program control weakness broken the most obvious effect of surrounding rock.Papers before and after the surrounding rock in the surrounding rock governance convergence, deep hole displacement, lining concrete stress field monitoring. Monitoring and engineering practice:take the studio anchor note program, the surrounding rock as a whole by reasonable force, deformation to meet the design requirements to reduce the displacement of the surrounding rock, increase the carrying capacity of the support structure to ensure that the tunnel circumference. Rock stable, long-term overall effective Qingdong mine soft and fractured the surrounding rock is difficult to support, difficult to maintain.Been successfully applied in the Qingdong mine soft and fractured the surrounding rock Governance engineering practice, the thesis research, crushing the surrounding rock governance provides an important reference for future similar conditions of weakness, soft and broken surrounding rock deformation mechanism furtherresearch and governance tools developed important reference and guidance.